VSEP
System Components
The VSEP filtration system consists of 6 major
components: the VSEP (Frame, Drive System,
Plumbing), Filter Pack, Interconnecting Piping,
Feed Pump Skid, and Metering Pump Skid (with
Cleaning Chemical Totes). For complete specifications,
please visit the corresponding product
page.
Frame
A 2" tubular steel construction is used
with an epoxy powder coat to assure resistance
to chemicals and weather. The Frame provides
structural support and vibration dampening
for the Drive System, Plumbing, and Filter
Pack.
Drive system
This patented system includes a 10-20 horse
power motor which drives an eccentric weight
and seismic mass, which in turn translates
the energy through the torsion spring into
the Filter Pack.
Plumbing
Teflon reinforced flex hoses and stainless
steel are used to assure maximum compatibility
with most solvents, caustics and acids, and
vibration dampening for Interconnecting Piping.
Filter Packs
VSEP filter packs employ a filament-wound outer
housing, membrane trays, stainless steel
end plates, polypropylene or Kynar permeate
carriers and epoxy resins. The membrane trays
consist of a stainless steel disc, drainage
cloth and the membrane. The trays are separated
by metal spacers and rubber gaskets, which
provide the spacing for the feed to flow
over the trays. The assembly is compressed
so that the gaskets form a seal to prevent
leaking. New Logic offers in its filter packs
virtually every type of membrane made today
including: acrylic; nylon; polyacrylonitrial
(PAN); polypropylene; polysulfone; polycarbonate;
PVDF (Kynar); stainless steel; Teflon; thin-film
composites; Tyvek and others. Most of these
membranes have a wide range of pore sizes
to choose from ensuring the optimum separation
for any application.
At one extreme, reverse osmosis membranes reject
most dissolved compounds, including salts,
while allowing water molecules to pass. Nanofiltration
membranes are used to reject molecules of sizes
ranging from 1 to 100 M.W. (these are sometimes
referred to as water softening membranes) while
Ultrafiltration membranes can reject molecules
of sizes ranging from 100 to 1 million M.W.).
Microfilters with pore sizes ranging from 0.1
micron to 10 microns are also available as
are woven screens with 1 micron pore size to
standard mesh sizes used for coarse separations.
The standard modular size of a VSEP System
is 100 to 1,500 square feet composed of discs
with a 19 inch (48 cm) active diameter. Each
disc element is manufactured and quality-assured
by New Logic.
Interconnceting Piping
A network of piping transfers feed or cleaning
solution to the VSEP Filter Pack from the Feed
Pump Skid, and then back as Permeate (clean)
and Concentrate (reject) streams. This piping
also includes flexible hoses that help dampen
VSEP vibration from being transferred back
to the Feed Pump Skid.
Feed Pump Skid
This skid includes mounted
pumps, piping, valves, instrumentation, cleaning
tank, meshed bag filters, and electrical controls.
The feed pumps are also used to pump cleaning
solution from the cleaning tank to the VSEP
Filter Pack. Valves are used to change destinations
between cleaning and feed. Instrumentation
is used for system status and for alarms that
protect the filter pack.
The electrical circuitry
contains two enclosures; one for electrical
components and one for solenoid air valves.
There are also motor speed controllers, which
are solid state control device used to run
the vibration drive motor, and feed pump motors.
The speed of the motor controls the vibration
amplitude, and feed pressure. The control circuitry
cabinet contains the PLC programmable logic
controller, HMI touch display, and the AC and
DC control circuitry.
Metering Pump Skid
This skid includes mounted chemical dosing
pumps and tubing and stands over chemical totes.
This allows for automatic transfer of cleaning
chemicals to the Feed Pump Skid cleaning tank.
The run time of these pumps is controlled by
timers in the programmable logic controller.
Control System
Operation of the VSEP Series i system is automated
by the PLC. The bulk flow passes through a
coarse bag filter prior to entering the VSEP
system to ensure large particles (bigger than
beach sand) are removed.
The feed water then flows to the VSEP module.
The water is fed through the top of the filter
pack, the permeate (clean water) exits the
top of the filter pack and the concentrate
(rejected material) exits the system through
a pipe at the bottom of the filter pack. A
valve on the concentrate exit is throttled
to maintain the proper recovery level (amount
of clean water recovered as a percentage of
the total).
Once or more times per week, the PLC takes
the VSEP module offline for a cleaning. By
controlling the air-actuated valves, the PLC
rinses the filter packs with warm water, then
and then meters approximately seven gallons
of concentrated chemical cleaning solution
into a 300 gallon clean-in-place (CIP) tank
mounted on the VSEP CIP skid. The dilute cleaning
solution is fed through the filter pack, and
the first 10% of the flow is diverted to drain.
This 10% will contain roughly 90% of the potential
foulants within the filter pack. The remaining
90% of the solution is recirculated for 30
minutes. The PLC then initiates a warm water
rinse, after which the second cleaner is metered
into the tank and the cleaning process is repeated.
After a final warm water rinse, the module
goes back online.
The VSEP system does not require a dedicated
operator. The PLC controls all important aspects
of the VSEP operation and will shut down upon
any alarm-inducing conditions. The VSEP PLC
can monitor tanks and equipment before and
after the VSEP system to prevent overflows,
etc. The operator is required to make routine
checks to the system at regular intervals.
See the Preventative Maintenance section of
the Appendix for further information.
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